AIR OXIDIZABLE SCRATCH RESISTANT PROTECTIVE LAYER FOR OPTICAL COATINGS
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United States of America Patent
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Issued Date -
Dec 1, 2011
app pub date -
Aug 10, 2011
filing date -
Dec 17, 2004
priority date (Note) -
Abandoned
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Abstract
The present invention provides a scratch protecting layer comprising a metal, metal alloy, metal compound or an intermetallic layer deposited on an air contacting surface. The scratch protecting layer is typically from 1 to 3 nanometers thick and not optically absorbing after oxidation occurs. This layer is initially deposited in a primarily unoxidized or un-nitrided state. Full oxidation of the metal, metal alloy, metal compound or intermetallic layer occurs within several days after exposure to air. The scratch protection layer can be 2 to 5 nanometers thick if the layer is exposed to a plasma, electrical discharge or ion beam comprising a reactive gas such as oxygen or nitrogen.
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